While the F75 will work in any of these modes, I found a killer setting. It was hard at first, I wasn't sure if I was missing targets or not. I have found old silver and clad with this seting.
I use a JE mode, disc on 1 or 0, thats right no disc. I set the sensitivity at 30-35, as the machine will become very nosiy most places above that. I use a 3 tone, and only dig good signals. You will find the smallest bit of foil will give a good tone, but you will know a coin when you hit it.
I bought the F75 so I would not have to dig trash. I still get fooled, but I dig more coins than anything else. This setting will also pick up on small chains as I find a lot of necklaces.
My ring count, and deep targets have dropped off. I wont say the F75 really cleans out a spot, but it seems I have to wait a few days in between hunts at the same spot.
There is over 500 settings and tuning can be a fine hair. EMI puts a lot of folks off on the F75, but it will produce for you. I run a older F75 regular, gold handled, and would love the new F75 with PB mode.
Sensitivity does not equal depth. Disc and notch will quiet or id unwanted targets, so a hi disc or notch setting can be used. The 5" inch coil does not loose much depth if any at all, and defies reasoning to me. The 5 inch coil does quiet the F75 down a bit also. Its a much slower hunt, but you will find good targets in the trashiest of areas with the 5 inch coil.
The F75 has a fast recovery speed. A slow coil swing does not produce better results. The F75 will actually id better and find deeper targets with a brisk swing. This is what I have found in the city parks, in sand, soil, and wood chips.